Desk letter scale



FIG. 1 is a left side elevational view of a desk letter scale showing my new design;

FIG. 2 is a front elevational view;

FIG. 3 is a rear elevational view;

FIG. 4 is a top plan view; and,

FIG. 5 is a bottom plan view thereof. 

The ornamental design for a desk letter scale, as shown and described. 